A unit square and a rectangle touching three square sides and passing through the midpoint of the upper side. What is the minimal blue area?
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Solution
The minimal blue area is 1/2.
![](https://mirangu.com/wp-content/uploads/2024/01/PeepingOut2Solution.jpg)
Note that Peeping out shows that the minimum is actually reached.
Video
Please find here the video solution: Video: Peeping out II.